Discussion: “Indentation of a Circular Membrane” (Yang, W. H., and Hsu, K.-H., 1971, ASME J. Appl. Mech., 38, pp. 227–230)

Abstract

pressures near the slot are again observed and the explanation no doubt lies in the flow curvature in the entrained flow, which is greater for the larger values of t/y c . The effect was first reported by George [4].The law-of-the-wall for wall jets is established in the present paper. The same conclusion is reached by Guitton, [5], for wall jets over logarithmic spirals when the curvature is small. This, and other work, is mentioned in the review paper by Newman [6].The inaccuracy of the von Karman momentum equation as a means of determining skin friction is well known, and was discussed very fully by Button [7].

High strain rate behavior of woven fabric composites under compressive loading

“…Force F 1 would be acting on the interface between the incident bar and the specimen whereas force F 2 would be acting on the interface between the transmitter bar and the specimen. The specimen geometry and L/D ratio are important to achieve dynamic stress equilibrium within the specimen [6][7][8][9]. The studies presented are with metallic materials considering elastic wave propagation [8].…”

“…After Kolsky [5] introduced the split bar technique for dynamic testing of specimens, SHPB has become the widely used experimental technique to test the materials at high strain rates. Various studies were carried out on specimen design [6], stress uniformity [7] and stress wave reverberation [8,9]. It was observed that the loading pulse with larger rise time generates better stress uniformity than the loading pulse with lesser rise time [7,8].…”

“…Various studies were carried out on specimen design [6], stress uniformity [7] and stress wave reverberation [8,9]. It was observed that the loading pulse with larger rise time generates better stress uniformity than the loading pulse with lesser rise time [7,8]. Rise time of the incident pulse can be increased by placing a pulse shaper such as a small strip of soft material at impact end of the incident bar.…”